Re: one model, multiple database instances

On 10 Aug 2004 07:47:43 +0200
Sebastien Bigaret <[email protected]> wrote:

Hi,
I realized I wrote my first reply in a hurry so I'm writing this up to give you more info on what I want to achieve so you can have a better idea of what's involved.

The application runs in a multithreaded application server, a client to database instance mapping
is done by the application already ( in its first incarnation it was accessing the DB (almost-)directly )
let's say that we have a mapping between an ID string and a database connection string.
These are my ideas and the may not play well with the way modeling is designed, but I hope will be a starting point.

What I want to achieve:

When I create an EC, I'd like to pass the ID string as a parameter and this should give me an EC
that works 'like' a plain old connection to the mapped database instance.

How to get there:

- change the mapping into: ID -> ( connection params, model )
?- subclass EC to support the ID string be passed on __init__
?- subclass ObjectStoreCoordinator to use the ID string information in EC to create/select a proper 		DatabaseContext.
?- at which level caches work in modeling: I obviously don't want rows from different database instances to mixup :-P

regards
--
Delio


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